#31DFF4
Closest named color: Aqua Blue (#02D8E9). oklch(83% 0.134 207.6), rgb(49, 223, 244).
Aa
Black text reads best on this color (12.99:1).
About this color
#31DFF4 is a light, moderately saturated teal or cyan. In OKLCH its lightness is 83%, its chroma 0.134 and its hue 208°. Its hue sits on the cool side of the wheel. The nearest named color is Aqua Blue (#02D8E9), ΔE 0.026 away. Black text reads best on it, at 12.99:1.
| Hue family | Teals and cyans |
| Lightness | light (83%) |
| Chroma | moderately saturated (0.134) |
| Temperature | cool |
| Nearest name | Aqua Blue (#02D8E9) |
| Black text | 12.99:1 |
| White text | 1.61:1 |
Values
| HEX | #31DFF4 |
| RGB | rgb(49, 223, 244) |
| HSL | hsl(186, 90%, 57%) |
| OKLCH | oklch(83% 0.134 207.6) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #31DFF4 | 1.61:1 | Fails | Lc -30.6 | Non-text elements, placeholder text |
| Black text on #31DFF4 | 12.99:1 | AAA | Lc 76.7 | Fine for body text |
| #31DFF4 text on white | 1.61:1 | Fails | Lc 27.1 | Dividers and decoration only |
| #31DFF4 text on black | 12.99:1 | AAA | Lc -75.8 | Fine for body text |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 300.
-
Step 50
50
#E8F9FC
oklch(97% 0.018 209.4)
-
Step 100
100
#CDF2F7
oklch(93.6% 0.039 206.5)
-
Step 200
200
#9EE8F3
oklch(88.6% 0.075 207.6)
-
Step 300
300 (this color)
#31DFF4
oklch(83% 0.134 207.6)
-
Step 400
400
#00B5C7
oklch(70.7% 0.121 207.4)
-
Step 500
500
#009BAB
oklch(63% 0.108 207.7)
-
Step 600
600
#008290
oklch(55.5% 0.095 208)
-
Step 700
700
#006E79
oklch(49.2% 0.084 206.9)
-
Step 800
800
#005A64
oklch(42.8% 0.073 207.9)
-
Step 900
900
#004B53
oklch(37.7% 0.065 207)
-
Step 950
950
#002D32
oklch(27.1% 0.046 206.3)
#31DFF4 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #CBD6F5 | 0.129 |
| Deuteranopia (no green cones) | #B1C3F4 | 0.119 |
| Tritanopia (no blue cones) | #00E9E5 | 0.041 |
| Achromatopsia (no color) | #CBCBCB | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31DFF4
#31DFF4
oklch(83% 0.134 207.6)
- #FFB0A5
#FFB0A5
oklch(83% 0.095 28)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #31DFF4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Aqua Blue #02D8E9 ΔE 0.026
- Turquoise #40E0D0 ΔE 0.052
- Robin's Egg #6DEDFD ΔE 0.054
- Medium Turquoise #48D1CC ΔE 0.058
- Vivid Sky Blue #4CC9F0 ΔE 0.059
- Bright Sky Blue #02CCFE ΔE 0.061
- Dark Turquoise #00CED1 ΔE 0.063
- Sky Blue #87CEEB ΔE 0.064
Use #31DFF4 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.